Spring mattress



v Dec. 17, 19290 c. RASMUSSEN I 1,739,985

SPRING MATTRESS- I Filed Jan. 5, 1927 Patented net; 17, 1929 PATENT OFFICE CARL KNUD RASMUSSEN, OF BRAUNSGHWEIG, GERMANY SPRING MATTRESS Application filed January 5, 1927, Serial No. 159,219, and in Germany-April 14, 1926.

My invention relates to a resilient reinforcement which is easily fixed to the frame of spring mattresses for beds, couches and the like.

Such a reinforcement which is suspended like a bridge transversely under the spring mattress is particularly suitable for making mattresses which have become slack and sag in the middle useful again. As the wire netting of used mattresses usually sags to a different extent in different parts of the mattress, the separate springs of the reinforcing means are loaded unevenly, with the result that the resting surface of the mattress becomes uneven. This disadvantage is overcome byiny new reinforcement. The springs of the said reinforcement are stressed independently of the condition of the wire netting of the spring mattress,.so that the latter always remains even by fitting my new reinforcement. g

A further advantage of my invention consists in this, that the reinforcement is adjustable for different Widths of mattress and I is readily tightened up for regulating the tension. 'A further advantage of my invention consists in this, that only tensionsprings are used, which have asofter action than compression springs.

In the accompanying drawing Figure 1 is a perspective view of a spring mattress-with .the new reinforcement and Figure 2 an elevation of the reinforcement with the mattress in cross-section.

Three pairs of upright pins 1 are provided at their ends with discs (Z and f. In holes in the said discs tension members are attached by means of eyes, the upper disc at of the pins Z being connected by chains e, and the lower discs fby tension springs g. The oppositely positioned pins of each pair (Flg. 1) are also connected, the two outer pairs both at their upper and at their lower discs by chains, while the middle pair are connected at the top and at the bottom preferably by rigid bars. To each pin Z of the two outer pairs additional tension members are attached, which consists of the parts a and b. The part a is attached to the upper disc d and the part b to the lower disc 7 of each of these pins. These tension members a, b, whir h also contain tension springs k, is, have their other ends attached to an eye h which is fixed to a clamp It. There are four of these clamps (Fig. 1) and they are so constructed that they are capable of being hooked over the side members a of the spring mattress m (Fig. 2) and of being slid along the said side members. Through this pushing apart (shortening of the bridge), Fig. 1, the members a, b will tension the springs ,7, l7 and Ir between the side members 0 of the spring mattress, when the reinforcement will level up the wire matting of the mattress m, on which the overlays n lie, as is shown in Fig. 2. The spreading apart of the tension members (Fig. 1), by'which the overall length of the reinforcing bridge can be varied within wide limits, enables the new reinforcement. to be used with mattresses of different widths, to be adjusted to strong or weak springing and to be tightened up in a simple manner. The clamps k are fixed on the side members a by means of screws 2' or the like.

What I claim is:

1. Means for reinforcing the resilient part of spring mattresses for beds, couches and the like, comprising in combination a bridge part, resilient members in the said bridge part, means comprising pairs of tension members for suspending the bridge part transversely under the mattress independently of the resilient part of the mattress, the tension members of each pair being capable of being slid along the side members of the mattress towards and away from one another for ad.- justing the tension in the resilient members in the said bridge part, as and for the purpose set forth. I

2. Means for reinforcing the resilient part of spring mattresses for-beds, couches and the like, comprising in combination a bridge part, helical springs in the said bridge part, pairs of tension members for suspending the said bridge part from the side members of the mattress transversely under the mattress independently of the resilient part of the mattress, andclam s connected to the said tension members or securing saidmembers to the side members of the mattress, said clamps being capable of being slid along the said side members, so as to enable the tension members of each pair to be moved towards 5 and away from one another for adjusting the tension in the said helical springs, as and for the purpose set forth.

3. llIeans for reinforcing the resilient part of spring mattresses for beds, couches and the like, comprising in combination upper and lower tension members, rigid spacing members connected to said upper and lower tension members so as to space the former from the latter and form with said tension members a bridge part capable of being stressed independently of the resilient part of the mattress, resilient members in the said upper and lower tension members for enabling the bridge part to yield elastically and means connected to said upper and lower tension members for releasably securing the bridge part transversely under the mattress to the side members of the mattress independently of the resilient part of the mattress and for adjusting the tension in the said resilient members independently of the tension in the resilient part of the mattress, as set forth.

4. Means for reinforcing the resilient part of spring mattresses for beds, couches and the like, comprising in combination a air of upper tension members and a pair 0 lower tension members, rigid spacing members connected to said upper and lower tension members so as to space the former from the latter and form with said tension members abridge part capable of being stressed independently of the resilient part of the mattress, resilient members in said upper and lower tension members for enabling the bridge part to yieldi elastically, said resilient members comprising a plurality of tension springs connected together one behind the other in one pair of tension members, and means connected to said upper and lower tension members for suspending the bridge part transversely under the mattress to the side members of the mattress independently of the resilientpart of the'mattressg. and for' ad'usting the tension in the said resilient members independently of the tension in the resilient part of the mattress, as set forth. In testimonytwhereof I have signed my name to this specification.

C. KNUD RASMUSSEN. 

